1) You must be a PowerUp Rewards member at the time of new Xbox 360 game purchase.
2) You must purchase the new version of eligible Xbox 360 game within the first 30 days of its release at GameStop.
3) Following the purchase of an eligible game, you will receive the guaranteed $50.00 trade-credit coupon via email** and in your PowerUp Rewards Active Offers.
4) Bring the in-store credit coupon with your game to trade toward the new Xbox One standard version of the same game at any U.S. GameStop location.
Redemption of the coupon must occur by December 31, 2013.
here is the list of games so far.